Finding untagged albums

I use tags to categorise my own music library in Roon. In effect, my tags are my own genre groupings as they mean more to me than the standard genre definitions.

How do I find albums where I have neglected to add my own tag (or tags).

I had hoped that I could do this in Focus via Inspector but, so far, I cannot see a way to do this.

Any ideas?

You’ve already asked the same question in the past and to my knowledge the answer you got is still valid:

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Thanks. I had completely forgotten having raised this before. Must be an age thing!